Chain punch

Abstract

A device for punching holes in a surveyor's chain and in metal pieces used for repairing the chain and for riveting together the punched chain and metal pieces comprising an elongated vertical housing having an elongated vertically oriented opening extending transversely therethrough and defined by a continuous wall, an upper vertical bore extending from the top of the housing into the vertical opening, a lower female die element received in the lower portion of the opening and having a flat horizontally extending recess therein whose width is equal to that of the chain to be repaired, the female die element also including a pair of spaced holes located on the flat recess, an upper male die member received in the upper portion of the opening and vertically slidable therein, the male die member having a pair of punching rods projecting downwardly, an arbor shaft having a threaded portion received in a threaded portion of the upper bore, a handle for rotating the arbor shaft, the arbor shaft having a lower portion adapted, upon rotation, to engage the upper end of the male die member for urging the male die member downwardly toward the female die member so as to urge the punching rods against a chain portion received in the flat recess on the female die member, whereby, upon continued rotation of the arbor shaft the punching rods will punch holes through the chain portion and pass at least partially into the openings in the female die member, and a lower handle or mounting for restraining rotation of the lower end of the housing. The device also includes rivet blocks to replace the die elements for securing rivets to overlapping prepunched metal strips.

What is claimed is: 
     
       1. A device for punching holes in a surveyor's chain and in metal pieces used for repairing the chain and for riveting together the punched chain and metal pieces comprising an elongated vertical housing having an elongated vertically oriented opening extending transversely therethrough and defined by a continuous wall, said vertical opening having an upper portion and a lower portion, an upper vertical bore extending from the top of the housing into said upper portion of said opening, the upper portion of said upper vertical bore being threaded, a lower vertical bore extending downwardly from said lower portion of said opening towards the lower end of said housing, a lower rivet block removably received in the lower portion of said opening and having a lower base removably received in the lower vertical bore, said lower rivet block having a flat horizontally extending recess therein whose width is equal to that of the chain to be repaired, said lower rivet block also including a pair of spaced shallow recesses located on said flat recess for receiving the heads of a pair of rivets, an upper rivet block removably received in the upper portion of said opening and in vertically slidable contact with the wall of said opening, said upper rivet block having a lower flat surface and a pair of flaring members projecting downwardly from said flat surface and adapted to flare the upper ends of a pair of rivets supported on said lower rivet block and projecting through a pair of overlapping prepunched metal strips received in said flat recess, an arbor shaft having a threaded portion received in the threaded portion of the upper bore, means for rotating said arbor shaft, the arbor shaft having a lower portion for engaging, upon rotation, the upper end of said upper rivet block for urging the upper rivet block downwardly toward said lower rivet block so as to urge said flaring members against the upper ends of said rivets, whereby, upon continued rotation of said arbor shaft, said flaring members will flare the upper end of said rivets, and means for restraining rotation of the lower end of said housing. 
     
     
       2. The improvement as set forth in claim 1 wherein said housing is provided with a pair of pin holes extending therethrough on opposite sides of said vertical opening in a horizontal position slightly above the upper surface of said lower rivet block, a holding pin having a horizontal portion removably inserted in said pin holes so as to overlie the metal strips received in the flat recess in said lower rivet block, said holding pin having a bowed portion along the central part of said horizontal portion and a right angled handle portion extending from one end of the horizontal portion, whereby the holding pin can be turned so that the bowed portion will engage the metal strips and hold them in position against the lower rivet block while the upper rivet block is inserted into the housing and lowered towards the lower rivet block.